U0002: High Speed CAN Communication Bus Performance
What Does U0002 Mean?
U0002 is a diagnostic trouble code indicating: High Speed CAN Communication Bus Performance. This code relates to the network communication system. It has been reported in NHTSA complaints across 5 different vehicle models.
Symptoms of U0002
- ⚠️ Check engine light illuminated
- ⚠️ Traction control system activated
- ⚠️ Vehicle enters limp/reduced power mode
Common Causes
- 🔍 Wiring or connector problem
- 🔍 Sensor or control module malfunction
U0002 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"I was sold this car from a dealer and told nothing was wrong with it, 2 days later codes U0002 (CAN communication BUS performance) and U0103 (Loss communication with gear shift module) came on and the car will go into what I believe is limp mode every 10-30 minutes into driving it. I believe the Col"
— Dodge Charger owner, 03/12/2023
"WE BOUGHT THIS VEHICLE ON MAY 6 , 2013, TWO HOURS LATER THE CHECK ENGINE LIGHT WENT ON. TOOK IT TO AUTOZONE AND HOOKED IT TO THE COMPUTER SAID IT WAS THE TRANSMISSION. PROCEEDED TO TAKE IT TO THE DEALER ON MAY 7TH 2013 WHERE THEY RAN A TEST AND FOUND CODE P0741 -U0002- CHECKED FOR CONTAMINATED FLUI"
— Dodge Charger owner, 05/06/2013
"WHEN DRIVING MY 2013 DODGE CHARGER SE ALL OF THE LIGHTS FLASHED ON THE DASH AND THE AUTO TRANS WOULD NOT SHIFT OUT OF 1ST GEAR . I RAN MY OBD2 AND IT GAVE A TROUBLE CODE OF U0002 HIGH SPEED CAN BUS. IT THEN STALLED ON THE HWY AND I ABOUT CRASHED THE VEHICLE DUE TO NOW POWER STEERING OR BRAKES. IT IS"
— Dodge Charger owner, 09/04/2017
Source: NHTSA Complaints Database
Most Reported Vehicles for U0002
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | DODGE CHARGER | |
| 2 | DODGE DURANGO | |
| 3 | DODGE NITRO | |
| 4 | JEEP WRANGLER | |
| 5 | JEEP CHEROKEE |
U0002 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Frequently Asked Questions
What causes communication codes?
Can a bad battery cause network codes?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Inspect wiring harness and connectors for damage, corrosion, or loose connections
- 🔧 Check battery voltage and ground connections; inspect CAN bus wiring
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.